<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.min.js"></script>
</head>
<body>
    <!--append()在被选元素结尾插入内容-->
    <p>这是测试的内容</p>
    <script>
        $('p').prepend('Hello xiaxiang');
    </script>
</body>
</html>